Daniel a



(No Model.)

B. A. WOODBURY.

BALANCED SLIDEYVALVE.

No. 331,018. Patented Nov. 24, 1885.

.WIT'NESSES:

INVENTOR:

ljnrrnn Sterne arnnr rrrcn.

DANIEL A. WOODBURY, OF ROCHESTER, NEXV YORK.

BALANCED SLIDE-VALVE.

EEPECIFICATION forming part of Letters Patent No. 331,018, dated November 24, 1885.

Application filed April 8, 1885.

To aZZ whom it may concern:

Be it known that I, DANIEL A. WooDBURY, a citizen of the United States, residing in the city of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Balanced Slide- Valves for Steam-Engines, of which the following is a specification.

My invention relates to improvements in balanced valves of the class in which the valve works under a reliefplate, and has for its obj ects, first, to increase the facilities for both the induction and eduction of the steam without increasing the thickness of the valve; second, to afford more convenient means for obtaining the alignment of the stuffing-box and valve rod guide; and, third, to provide better and more compact means for adjusting the pressure of the reliefplate upon the valve.

In the drawings, Figure 1 is an elevation, the steam-chest being shown in section and the relief-plate removed; Fig. 2, a horizontal longitudinal section through the center, with only fragments of the cylinder and relief plate shown; Fig. 3, a transverse section through the center of the valve with fragments of the surrounding ports. Fig. 4 is also a transverse section through the valve, showing a modification.

The cylinder A is in the usual form, when intended to be used with a D slide-valve, being provided with the usual steam ports and passages, a a, and exhaust-port b. The ports are somewhat enlarged to adapt them to use with avalve having supplemental ports. The steam-chest B is shown cast in one piece with the cylinder, but may be separate, if desired. It is provided With the usual cap or cover, E. The valve 0 is provided with a central exhaustcavity, f, and with supplemental exhaust-passages e e and steam-passages d d. The passages d d are connected at one end through the passage R, running along the side of the valve, as shown in Fig. 1. Two such passages may be used, if desired, one upon each side, as shown in Fig. 4. If the valve he of equal thickness at both edges, two are best, if trapezoidal, one is preferable. This device applies equally well to a double-D valve, but in that case only one of the pas- Serial No. 161,560. (No model.)

sages e is required in each valve, and the other should be omitted. In order to give greater passage-way into and from R, the passagesd d are enlarged where they connect with it. It will be readily seen that this arrangement gives four different points of admission, one at the end, as in an ordinary D-valve, another at the same end through the cavity 9 and passage (Z, and two at the opposite end into d and through the passage R to d, thence into the cylinder-port a. The same operations will take place in the opposite direction when the valve is in the reverse position. As these additional points of admission are not ordinarily important, except just after the opening and just before the closing of the port, or

when working at short points of cut-off, the passage R may be of quite moderate size.

I am aware that valves have been provided with passages connecting those corresponding with d d. The patents of J. F. Allen, No. 95,858, and S. E. Jarvis, Nos. 267,7 91 and 278,020, all show such passages. Neither of these, however, )errnit the use of the passages e e, and the additional facility for eduction afforded by these passages is very important. They also all require a large addition to the thickness of the valve to obtain even an ordinary exhaustcavity. This increases the danger from the unequal expansion of the ports and adds to the weight.

That the valverod P may obstruct the infiowing steam as little as possible,it is attached rigidly to the valve. This necessitates the adj ustment of the stuffing-box and the slide-box I to procure and maintain the proper alignment of the ports. For this purpose the plate H of the supportingbracltet is made adj ustable along the face of the chest. The body or barrel of the stuffixing box K extends through this plate and the wall of the chest and is provided with the wide flange or collar L. It fits closely in the plate, but the opening through the wall of the chest is made larger to leave an annular space, 3, around it, of sufficient size. to admit of all needed adjustment. This flange is broad enough to not only cover this opening, but the packing ring or gasket 0, making a steam-tight joint.

As the stuffing and guide boxes must move simultaneously, it isobvious thatathe adjustment of one will:also.,adjust.the'other; To effect an adjustment the nut N and bolts k k are slackened and the plate moved along the face of the chest until the proper position is reached, when by tightening them again the whole is againsecured.

As shown.the stuffing-box proper is formed in the end of K, and the cap Ofitsthe same thread as the nut N; but, if desired, all out-' side of the nut may be made separate andscrewed into it, or attached in anyother-con venient way. The weight of the valve and the pressure due to its unequal thickness at theand truly to a common plane, and the bear-ing-v surfaces of therelief-plate also made true'and level, it will when in place bear evenly throughout. Then by a slight forwardmovement of the wedge as much ofthe pressure as is desired will be brought to bear upon the supports. adjusted will take care of itself for a long time, the nut m-should then be screwed down firmly, to not only assist in preventing :plate, the combination of the exhaust-cavity f, L passage or passages e, passages d and d, and :passage or passages R, all'arranged and operatingsubstantially as set forth.

,ing the rod or spindle attached rigidly thereto,

As the valve when once properly leakage,but.meddlesome interference with the 3 5 adjustment.

I am aware that the device of Howaldt,l?atent No. 301,990,resembles this in some of its features; but that herein shown and described possesses,among other advantages,that of en- 0 abl-ing the wedge tobereadilylremoved and replaced, and without interfering in the least withthe adjustments. It also only requires one opening'through the wall of the chest, and in this the screw fits tightly, and can'there- 45 fore be much more easily kept from leaking. 'What I claim as my invention, and desire to secure by Letters Patent, is-

1. In a slide-valve working under a relief- 2. The combination, with a slide-valve havof an adjustable bracket provided with suitable guide-box or guide, and a stuffing-box, constructed and operating substantially as shown and described.

3. The combination, with an adj Listing-wedge and adjusting screw, of the nut m, located in-' side of the chest, substantially as and for the purpose specified.

DANIEL A. WOODBURY.

Witnesses:

=HENRY B. HOWE,

A. M. BAssErT. 

